Abstract
The identification of clay minerals is difficult and often becomes complicated in case of kaolinite where 0.72 nm peak of kaolinite is obscured by a strong second order (002) peak of Fe-rich chlorite which also diminishes on heating to 550°C, resulting in misidentification as kaolinite. As different heat treatments, to differentiate Fe-rich chlorite and kaolinite, were found unsatisfactory, a more valid technique, specific for kaolinite identification, was adopted which differentiated the first order peak of kaolinite (0.72 nm) by shifting it at 1.1 nm. This technique involved subsequent treatment of clay by Cesium Chloride (CsCl), Dimethyl sulfoxide.(DMSO), Hydrazine hydrate (HzHyd), and Potassium acetate (KOAC) before it was mounted on a glass slide for XRDA. Further, the peaks on de-intercalation were found more or less of the same pattern which means that the original structure of kaolinite on deintercalation (by heating at 100°C) tends to be restored.
A. Ali1 , D.A. Jenkins1 . (1996) A MORE VALID CONFIRMATORY TEST FOR KAOLINITE IDENTIFICATION IN CLAY MINERALS INVESTIGATION BY XRDA, The Journal Soil & Environment , Volume 12, Issue (3-4).
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